Napa to Sonoma Half Marathon

Napa to Sonoma Half Marathon 2026 Course Analysis

Napa to Sonoma Half Marathon is a half marathon held in Napa, United States of America, scheduled for Sunday 4 October 2026. The course is run on road surface with 132m of total elevation gain, reaching a maximum altitude of 68m above sea level. For registration and full race details, visit the official Napa to Sonoma Half Marathon website.

Elevation Profile

With 132m of elevation gain, this is a moderately undulating course. The route ranges from 3m to 68m above sea level (65m total range). While not completely flat, the elevation changes are manageable for most runners and shouldn't significantly impact pacing strategy.

Expected Race Day Weather

Based on historical weather data for October, the expected race day conditions are as follows. Moderate temperatures between 12°C and 31°C are expected. While comfortable for most runners, those targeting fast times should pay attention to hydration, as these temperatures can impact performance over the full distance. There is a low chance of rain (0%), so dry conditions are likely.

Surface Type: Road

Napa to Sonoma Half Marathon is run on road surfaces, which provide the fastest and most predictable conditions for marathon running. Road courses allow for consistent pacing and are typically the best choice for runners targeting a personal best time.

How Difficult Is Napa to Sonoma Half Marathon?

Our difficulty rating for Napa to Sonoma Half Marathon is calculated using a model that combines elevation gain, temperature impact, and surface type. Use the difficulty calculator above to enter your target finish time and see exactly how many minutes this course would add or subtract compared to a perfectly flat, cool, road-based half marathon. Faster runners and slower runners are affected differently by the same course conditions, so the difficulty is personalised to your pace.

Looking for an easier marathon or a tougher challenge? You can also compare Napa to Sonoma Half Marathon against other half marathons to find the right race for your goals.